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The calculations give you one vane traveling 360 degrees. For calculating the radius values for a vane only traveling 90 degrees (for a 4 vane drum) Im assuming you will need to use (pi x diameter) /4 in steps 1 and 2 for the right triangle base.

A full set of "Alarms" you can upload along with a graph of a roast. It would allow you to load the alarms, use the graph as a template background, run the roaster with Artisan control, and compare what your machine does to what mine did.